On Sat, May 16, 2015 at 5:43 PM, Richard B. Main, Esq. <mainpatents at gmail.com> wrote: It's the same pinout, but the 8041 is NOT rated for application of +25V to the EA pin, as used to do ROM verification of the 8741. Does the Pro-Log have a specific setting for 8041, or are you using the 8741 setting and overstressing the part? I've successfully read 8048 parts using a programmer configured for 8748, but I only did that on parts that I could afford to sacrifice. I don't have spares of the IOC 8041A, so I'm building a kludge to read it properly without applying 25V to EA.

On Sun, May 17, 2015 at 1:55 PM, Alexandre Souza <alexandre.tabajara at gmail.com> wrote: 25V isn't used for reading the 8041 and 8048, but it *is* used for reading the 8741, 8741A, 8748. That can be seen in the Intel datasheets as well as the MCS-48 and UPI-41 user manuals. I've also verified the presence of 25V during read on multiple device programmers. I have in fact read some 8048 and 8049 parts as 8748 and 8749, respectively, but only with parts that I had spares of, since the 8048 and 8049 are NOT rated for use of +25V to read, and instead are supposed to be read with EA at +12V. While it's reasonably plausible that putting +25V on EA won't damage an 8041A, I don't have another instance of the 8041A with the same code, so I'm not willing to risk it.